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https://issues.apache.org/jira/browse/CASSANDRA-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390760#comment-14390760
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Philip Thompson commented on CASSANDRA-9086:
--------------------------------------------
Are you able to reproduce this consistently? Do you know if the row existed or
not beforehand? It will help us know if this is incorrectly overwriting data,
or should be applying, but incorrectly reporting a failure.
> CAS precondition mismatch - row is still inserted
> -------------------------------------------------
>
> Key: CASSANDRA-9086
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9086
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra version 2.0.11
> 24 nodes in 4 datacenters (6 nodes per dc)
> Reporter: Roger Schildmeijer
> Priority: Critical
> Fix For: 2.0.15
>
> Attachments: conditional_insert_failure_cleaned.txt
>
>
> Cassandra claims CAS precondition didn't match current values[1], but the row
> is still inserted.
> We are having a quite simple cf schema:
> {code:xml}
> create table index (
> u text PRIMARY KEY,
> abc set<uuid>,
> ) WITH
> compaction={'class': 'LeveledCompactionStrategy'};
> {code}
> CQL statement:
> {code:xml}
> INSERT INTO index(u, abc) VALUES(?, ?) IF NOT EXISTS
> {code}
> Sometimes, especially during some write load, Cassandra claims the
> conditional insert wasn't satisfied ([applied] false), but the row is still
> inserted.
> The response from the conditional insert contains [applied]=false + the data
> we tried to insert.
> A full CQL trace is attached.
> [1] CAS precondition CAS precondition
> org.apache.cassandra.cql3.statements.CQL3CasConditions@1b2576ce does not
> match current values ColumnFamily(username_index
> -{deletedAt=-9223372036854775808, localDeletion=2147483647,
> ranges=[abc-abc:!, deletedAt=1427889576525999, localDeletion=1427889564]}-
> [:false:0@1427889576526000,abc:39f1a470ee694761a8197c0d0ada8e8f:false:0@1427889576526000,])
> | 11:59:37.060 | /10.0.0.1 | 533702
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